All stories related to difficulty in getting an anesthesia during childbirth with a lower back tattoo are a myth. There are no reasons why a tattoo would affect your ability to have an epidural during childbirth.Still, follow your anesthesiologist advice, owing to your different body type.
Also remember, there are other methods to make your body numb. So, just shed all your fears and go for that lower back tattoo you’re dying for.